Lignocellulosic Composite Binder Hardening via Esterification
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Solution Overview
Problem
Existing processes for producing lignocellulosic composites using high-frequency electrical fields incorporate binders containing hazardous substances like formaldehyde and isocyanates, and are based on petrochemical substances, posing environmental and health concerns.
Innovation Solution
A process involving the application of a high-frequency electrical field to a mixture of lignocellulosic particles and a binder, where the binder is composed of compounds that harden via esterification, using biobased components and reducing the emission of toxic volatile organic compounds (VOCs) and formaldehyde.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional petrochemical binders containing formaldehyde and isocyanates are used in high-frequency electrical field processes, then production efficiency and binder hardening are improved, but environmental pollution and health hazards increase
Solution Approach 1:
The invention changes the chemical composition parameters of the binder from traditional petrochemical-based formaldehyde and isocyanate systems to a new system based on biobased polyols and dicarboxylic acids that harden via esterification. This parameter change maintains the binder's functional performance while eliminating harmful emissions, directly resolving the contradiction between productivity and harmful factors
Solution Approach 2:
The invention converts the previously harmful esterification reaction (when using traditional binders) into a beneficial process by using biobased components. The esterification of biobased polyols with dicarboxylic acids under high-frequency electrical field heating produces no harmful emissions, transforming a potentially harmful chemical process into an environmentally beneficial one while maintaining production efficiency
2Object-generated harmful factors
If biobased binder components are used to reduce harmful emissions, then environmental friendliness is improved, but binder hardening efficiency and quality parameters may deteriorate
Solution Approach 1:
The invention replaces traditional thermal hardening mechanisms with high-frequency electrical field heating. This substitution enables rapid and efficient hardening of biobased binders through direct dielectric heating of the esterification reaction components, ensuring that binder hardening efficiency and quality parameters are maintained or improved despite using biobased materials
Solution Approach 2:
The invention optimizes the parameter combination of biobased polyol molecular weight, hydroxyl value, and dicarboxylic acid structure to achieve optimal hardening efficiency. By carefully selecting and adjusting these parameters, the binder maintains reliable hardening performance under high-frequency electrical field conditions while remaining environmentally friendly
3Use of energy by moving object
If high-frequency electrical field is applied for binder hardening, then energy efficiency is improved, but binder composition requirements become more stringent
Solution Approach 1:
The invention specifies precise parameter ranges for the binder composition including polyol molecular weight (500-5000 g/mol), hydroxyl value (30-200 mg KOH/g), and dicarboxylic acid structure to ensure optimal response to high-frequency electrical field heating. These parameter specifications enable efficient energy utilization while maintaining manageable composition requirements through clear design guidelines
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process achieves the production of lignocellulosic composites with a higher proportion of biobased binder components, maintaining similar or improved quality parameters such as internal bond strength and swelling resistance, while reducing harmful emissions.
Implementation Method 1
a high-frequency electrical field is applied, typically for heating an intermediate material mixture
Implementation Method 2
a binder comprising as components for hardening the binder via esterification at least one, two or more compounds having two or more hydroxy groups and additionally at least one, two or more compounds having two or more carboxyl groups
Data Source
AI summary
Described is a process of producing a multilayer lignocellulosic composite comprising one or more lignocellulosic composite layers or a single-layer lignocellulosic composite, wherein a high-frequency electrical field is applied and wherein a binder comprising for hardening the binder via esterification at least one, two or more compounds having two or more hydroxy groups and additionally one, two or more compounds having two or more carboxyl groups is provided or prepared. Furthermore described is a lignocellulosic com- posite, which is preparable according to said process, a construction product comprising such lignocellulosic composite and the use of such lignocellulosic composite as a building element in a construction product. Moreover is described a binder for producing a lignocellulosic composite.